Derek92994's 700 Ser II White Oak conversion

[laatsch55]

Build a DBT, a variac will limit voltage BUT NOT CURRENT....you can tell if you're coming on against a short with a variac but you have to pay close attention and listen to the beginning of the squeal...

And you are very welcome Darc....really glad I can help and be successful...

 

[derek92994]

DBT needs small clamps on the positive and negative right?

 

[laatsch55]

Dim Bulb Tester....100 watt bulb in a light fixture wired so the bulb is in series with the ac outlet built in the tester...

 

[laatsch55]

Like so...ac outlet for variac, and then amp after done with variac..

 

[laatsch55]

I'm goin to bed Darc.......

 

[derek92994]

No worries Lee, have a good rest.

 

[NavLinear]

Some reference material that may help. Some a bit dated.

 

[laatsch55]

Coolness Dennis!

 

[WOPL Sniffer]

View attachment 57072 View attachment 57073
All outputs when in backplane are Shorted both C to E and C to B except bottom output which measures 224 C to B and shorted C to E
What procedure and measurement do I use to check resistors? And what do they look like?

Hmmmmmm

 

[WOPL Sniffer]

Ok will clean the boards up also

Yep, chase down the solder balls, flux etc.... Might be a waste though as the back of the boards, which is inaccessible, are probably in the same condition.

 

[laatsch55]

No...the back I did clean before it went together.

 

[derek92994]

Gathering supplies for dim bulb tester, bulbs are hard to find, got one on order. Just need dual power socket with switch and sil pads. Got a couple of outputs on order from mouser. There will be a wait on parts, just have to be patient. Some good reference material there

 

[laatsch55]

Sounds good Darc...

 

[derek92994]

Outputs in, boards cleaned, just ran thru some testing of outputs soldered in with Lee.

 

[derek92994]

I have questions, DBT, i use the switch to turn it on and off, but it is not a bypass switch to bypass the bulb.
Active goes thru switch then thru bulb positive to negative then that goes to active on power socket. Negative and earth go straight to socket. Good?

 

[laatsch55]

Lookin good Darc...

 

[laatsch55]

Yes, one leg goes thru the light to the amp, other leg from amp goes to the other AC in ...., so basically you have all the current going through the bulb filiment, the more current, the brighter the bulb. Feed the DBT with the Variac..

 

[derek92994]

Dbt plugs into variac then amp plugs into dbt socket?

 

[derek92994]

Will have a cig and post pics. But first, there is some debris down the bottom of the chassis, use vac to suck it out?

 

[laatsch55]

Yes...